toolnode

app.py

@@ -5,6 +5,7 @@ import random
 from langchain_huggingface import ChatHuggingFace, HuggingFaceEndpoint, HuggingFacePipeline
 #from langchain.schema import AIMessage, HumanMessage
 from langgraph.graph.message import add_messages
+from langgraph.prebuilt import ToolNode
 from langchain_core.messages import AnyMessage, HumanMessage, AIMessage
 from langchain.tools import Tool
 import os